SADE Export Web Site Claire Tinel, Denis Blumstein, Patrice Henry - CNES Pascale Lafitte - CNES GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

Outline CNES Calibration Methods SADE Database SADE Export Web Site GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

In-flight calibration of optical sensors using natural targets Main calibration Methods 5 calibration methods are routinely used to calibrate sensors These calibration methods are used operationally at CNES for POLDER 1, 2, 3 (PARASOL), VEGETATION 1 and 2, for SPOT satellites, MERIS, MODIS, FORMOSAT-2 and KOMPSAT-2 + Calibration over equipped test sites Coming soon : lunar calibration (Venµs and PLEIADES) Deserts Sun Glint Rayleigh Snow Clouds (Tuz Golu Campaign) (La Crau) GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

Multi-temporal Calibration methods Deserts : cross and multi-temporal calibration Comparison of measured reflectance with reference reflectance (same or other sensor) acquired in the same geometrical conditions Sun glint calibration : interband calibration Observe the white reflection of the sun over the ocean surface Interband calibration w.r.t. a reference spectral band (620 nm) Rayleigh calibration : absolute calibration of bands < 700 nm Observe the atmosphere over ocean (dark) Rayleigh scattering : > 80% of signal Deep convective clouds : interband calibration Observe the white reflection of the sun over clouds Interband calibration w.r.t. a reference spectral band Snow : multitemporal calibration and/or intersensor calibration Observation of stable snowy sites at high altitude (3200 m) GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE: Structure d’Accueil de Données d’Etalonnage (Calibration Data Repository) Multi-temporal calibration and cross-calibration and/or absolute calibration of optical sensors (visible → NIR) through different methods Easy data management, link between satellite measurements and calibration results (traceability) Common calibration tool for all sensors for one given method GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Base Content: MUSCLE Tools (Front-End Graphic) TOA reflectances Calibration results (coefficients) Synthesis results (means, models) MUSCLE Tools (Front-End Graphic) Extraction and insertion of measurements Calibration Synthesis Exogen data (climatologic models 4/day ) NCEP : pressure, water vapour EPTOMS : ozone GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Exogen data GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE For each measurement: For each "elementary " calibration result: Mean TOA reflectance value + standard deviation per band Geometrical conditions : zenithal and azimuthal viewing/solar angles Pressure, water vapour, ozone, aerosols optical depth Product name N1, Acquisition date SADE identifier For each "elementary " calibration result: One calibration coefficient per band Name of the method Tool name, tool version and tool parameters Processing date User name SADE identifier GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Export Web Site : deserts data Systematic collect of satellite acquisitions on desertic sites : 3 000 000 data ~ 10 % of SADE content Operational monitoring of CNES sensors calibration (on a monthly basis) : SPOT(s)/High Resolution SPOT(s)/Vegetation-1&2 PARASOL Calibration monitoring and intercalibration of other sensors on a regular basis (through cooperation agreements with other space agencies) High resolution : Formosat-2 (Taiwan NSPO), Kompsat-2 (South Korea KARI) Coarse resolution : MERIS (ESA), MODIS/AQUA GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

20 sites selected over North Africa and Arabia SADE Export Web Site : deserts data 20 sites selected over North Africa and Arabia GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Export Web Site : deserts data Desert Sites Database (from 1985 until 2010) AVHRR POLDER SPOT MERIS MODIS GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES

SADE Export Web Site : deserts data SADE Export web site (currently under development): Provides TOA calibrated reflectances on desertic sites for the GSICS community Access with a login user Updating every 6 months Still remains to do: Synthesis table Sensors description GSICS community opening : March 2010 Desert SADE Data Access GSICS WG Meeting – Feb 2010 – Claire Tinel / CNES